Compared to ultraviolet waves, the wavelength of infrared waves is
A) shorter.
B) the same.
C) longer.
Answer: C
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Which of the following are active galaxies?
A. quasars B. radio galaxies C. Seyfert galaxies D. All of these choices are correct.
Ice cream, when eaten, gives about 2100. Calories/kg to the body. On the other hand, the body must give back energy to warm it up to body temperature (37°C). Assuming ice cream has similar thermal properties to water:
(a) 1/2 kg produces how much energy? (b) 1/2 kg absorbs how much energy to reach 37°C? (c) What is the net gain or loss (eating 1/2 kg ice cream)?
How does the Sun's mass compare with that of the planets?
A) It is a hundred times more massive than all the planets combined. B) It is a thousand times more massive than all the planets combined. C) It is about as massive as all the planets combined. D) It is a thousand times more massive than Earth. E) It is a hundred times more massive than Earth.
Around Sun-like stars, we have, to date, only found Jupiter-like planets
Indicate whether the statement is true or false